EPA believes that engineered Solid Refuse Fuel (SRF) would be considered a non-waste fuel under the 40 CFR Part 241 Non-Hazardous Secondary Materials (NHSM) regulations when combusted in cement kilns, provided certain specifications are met. The SRF production process, which consists of Mechanical Biological Treatment, mechanical refinement, a Near Infra Red system, and shredding, meets the definition of processing in 241.2. SRF meets the legitimacy criteria for fuels in 241.3(d)(1), including management of the material as a valuable commodity, the material must have a meaningful heating value and be used as a fuel to recover energy, and comparability of contaminant levels to traditional fuels for the material.